EP4434682A1 - Tool - Google Patents

Abstract

Tool (1), comprising - a handle element (101), - a rod (103) firmly received in the handle element (101), which has a second stop (103a) at its end opposite the handle element (101), - a weight (105) which is guided so as to slide on the rod (103) and which has a third stop (105a) on its side facing the handle element (101) and a fourth stop (105b) in its interior, wherein the handle element (101) has a first stop (101a) at its end facing the weight (105), so that the weight (105) can be struck with its third stop (105a) on the first stop (101a) and alternatively with its fourth stop (105b) on the second stop (103a).

Description

The present invention relates to a tool with two impact directions for use as a hammer and as a pull hammer.

Tools, especially hammers, have been known for a long time for forming materials. The force is transmitted in an impulse-like manner by a striking movement with which the hammer is struck on the material. When using pull hammers, also known as sliding hammers, the force is not transferred directly to the workpiece by the striking movement, as is the case with a classic hammer. The swinging movement of the classic hammer is replaced by a pulling movement of a weight that is movably mounted on a rod. This rod is connected to the structure on the workpiece side and has an attachment point at the other end. This movement of the weight on the rod is braked in an impulse-like manner when the weight hits the attachment point. By forwarding the exerted impulse force, the force is applied at the end of the rod on the workpiece side.

There are several pull hammers available on the market from different manufacturers. However, all of them are based on the principle described above, which is used in DE 20 2011 004 262 U1 In addition to the above functional principle, a handle is provided on the rod, with which the rod can be held and guided in a precise position on the workpiece. DE 20 2011 004 262 U1 also discloses a stand and describes this adjustable stop using a spring, which is considered to be state of the art. In addition, the length of the rod available for guiding the weight is adjustable. DE 20 2017 002 407 U1 discloses a pull hammer whose weight (pull pulse generator) and the handle on the workpiece side are connected by a rubber band.

Although each known solution is described as advantageous in itself, there are disadvantages to using the known pull hammers. During use, parts of the hand are occasionally crushed when the weight hits the handle element or the base, which acts as an attachment point. In addition, there is currently no way to shape material in spatially limited, difficult-to-access construction spaces with just one tool, for example to create a bead. In this case, the material is typically formed using a chisel and careful hammer blows, or, if the installation space is large enough and there is a larger area available, directly using the hammer. This means that two tools are usually required, and using them is difficult in small installation spaces.

There is therefore a need for a new, flexible tool.

The present invention is therefore based on the object of overcoming the disadvantages of the prior art and providing a tool which, with a small installation space and the desired local force effect, can be used on the one hand as a hammer with a significantly reduced risk of displacement and on the other hand as an improved pulling hammer.

• ein Griffelement (101),
• eine in dem Griffelement (101) fest aufgenommene Stange (103), die an Ihrem dem Griffelement (101) gegenüberliegenden Ende einen zweiten Anschlag (103a) aufweist,
• ein auf der Stange (103) gleitend geführtes Gewicht (105), das einen dritten Anschlag (105a) an seiner dem Griffelement (101) zugewandten Seite und einen vierten Anschlag (105b) in seinem Inneren aufweist,

wobei das Griffelement (101) an seinem dem Gewicht (105) zugewandten Ende einen ersten Anschlag (101a) aufweist, so dass das Gewicht (105) mit seinem dritten Anschlag (105a) auf den ersten Anschlag (101a) und alternativ mit seinem vierten Anschlag (105b) auf den zweiten Anschlag (103a) aufschlagbar ist.The above-mentioned object is achieved in a first aspect of the present invention by a tool (1) comprising

• a handle element (101),
• a rod (103) fixedly received in the handle element (101) and having a second stop (103a) at its end opposite the handle element (101),
• a weight (105) sliding on the rod (103) and having a third stop (105a) on its side facing the handle element (101) and a fourth stop (105b) in its interior,

wherein the handle element (101) has a first stop (101a) at its end facing the weight (105), so that the weight (105) can be struck with its third stop (105a) against the first stop (101a) and alternatively with its fourth stop (105b) against the second stop (103a).

The "grip element" (101) according to the present invention serves to hold the tool (1) with one hand on or near the workpiece to be machined. For this purpose, the grip element (101) preferably has grooves or depressions that make it easier to grip.

According to the present invention, "stop" refers to the intended end point of the movement of the corresponding elements of the tool (1), here the first stop (101a) and the third stop (105a) as well as the second stop (103a) and the fourth stop (105b) each form half of a positive connection for optimal power transmission.

The weight (105) is held with the other hand and glides back and forth on the rod (103) to transmit force by striking the corresponding stops. Since the weight (105) itself represents a type of handle, it also preferably has grooves or depressions that make it easier to grip.

The tool (1) according to the invention generally has the advantage that a second impact direction is possible with a single tool, which is particularly useful in tight installation spaces. The tool (1) according to the invention can thus be used both as a pull hammer and as a hammer.

In a further development of the tool (1) according to the invention, the first stop (101a) is concealed inside the handle element (101).

In contrast to the known solutions, the concealed first stop (101a) onto which the third stop (105a) strikes significantly reduces the risk of injury, e.g. from bruising, since the skin of the hand holding the handle element (101) cannot be pinched or can only be pinched to a very small extent. This effect is further promoted by the fact that the handle element (101) and the weight (105) are designed on the outside at the points that are touched by skilled tradespeople during use in such a way that a secure grip is possible and slipping is impossible.

An embodiment of the tool (1) according to the invention provides that the weight (105) is tapered on its side facing the handle element (101) so that it is at least partially received in a recess of the handle element (101) when it strikes the first stop (101a).

This further reduces the risk of injury mentioned above, and the handle element (101) and weight (105) are guided safely and can be stored in the pushed-together state without dirt getting in, which would hinder sliding on the rod (103). A further advantage is that by at least partially accommodating the weight (105) in the Handle element (101) increases the extension length of the tool (1) according to the invention in relation to its compact length.

In order to be able to adjust the impact hardness of the tool (1) according to the invention within certain limits, it has proven advantageous in another development if the tool (1) further comprises a spring (107) which is accommodated inside the weight (105), wherein the preload of the spring (107) for the impact hardness of the weight (105) can be adjusted by rotating the weight (105).

According to the state of the art, the preload of a spring could already be adjusted, but this required either an additional hand tool or both hands to twist a multi-part weight against each other. Changing the preload and thus changing the impact force was not possible during current use.

With the present invention in this embodiment, the preload of the spring (107) can be changed by turning the weight (105) relative to the fixed rod (103) with one hand, without having to remove the other hand from the handle element (101). This advantageously makes it possible to adapt the impact force to requirements during ongoing use of the tool (1) according to the invention, even in a tight installation space. In principle, the tool (1) according to the invention no longer has to be removed from the workpiece to be machined.

It has proven to be advantageous for the handling of the tool (1) according to the invention if, in a special embodiment, the handle element (101) has a funnel-shaped extension (1011) at its end facing the weight (105). This funnel-shaped extension (1011) serves on the one hand to prevent the hand from slipping on the handle element (101) when the tool (1) according to the invention is held there. The funnel-shaped extension (1011) also serves as a gripping recess for the thumb of one hand when the tool (1) according to the invention is guided one-handed and held by the weight (105). The latter use is described below.

Another development of the tool (1) according to the invention provides that it further comprises a receiving device (109) arranged on the handle element (101), which is oriented towards a workpiece to be treated.

In this holding device (109) provided according to the invention, various working elements can be mounted that are necessary for machining a workpiece. Since the tool (1) according to the invention can be used both as a pull hammer and as a hammer, the possible applications are further expanded by the holding device (109).

In one embodiment, the receiving device (109) particularly preferably receives elements that can be attached to contact points of a structure to be dented in order to transmit force from the tool (1) according to the invention, so that the tool (1) acts as a pulling hammer. For example, various adhesive pulling adapters attached to a structure to be dented can be attached to this receiving device (109).

In an alternative embodiment to the above embodiment, it is particularly preferred that the receiving device (109) receives inserts that can be attached to transmit force from the tool (1) to a structure to be deformed, so that the tool (1) acts as a hammer. For example, different types of chisels, e.g. for creating beads, can be attached to this receiving device (109). A space for executing a hammer swing is not necessary.

A special embodiment of the tool (1) according to the invention provides that the receiving device (109) receives an insert designed as a flexible knife, which is designed to be introduced into a bond or cement between two body parts by means of the impact function and to be pulled out again by means of the pulling function, so that the bond or cement can be released.

This special design enables very simple and effortless removal of adhesive or cement between two body parts, for example between a lower beam and an upper panel. The flexible design of the knife, which can be used in different lengths, makes it easy to use even in hard-to-reach places. The impact function of the tool (1) according to the invention is used to push the knife into the adhesive or cement Since conventional knives often get stuck there, it is an advantage of the invention that the knife can be very easily pulled out again using the pulling function of the tool (1) according to the invention in order to reposition it at the next glued or cemented point. In this special embodiment, the impact function as a hammer and the pulling function as a pulling hammer are advantageously combined with one another.

These two alternative embodiments significantly expand the field of application of the tool (1) according to the invention and offer two essential basic functions in one tool.

For longevity and easy handling, it has proven advantageous if the weight (105) has linear ball bearings in order to slide on the rod (103) with optimized friction.

Finally, the present invention presents a further embodiment in which the tool (1) has a closed flat end (111) at the outside end of the weight (105).

This closed flat end (111) serves, among other things, to set up the tool (1) according to the invention so that it cannot tip over. In addition, the outer end of the weight (105) can be widened in a funnel shape so that on the one hand slipping of the hand is prevented and on the other hand the contact surface is increased.

This design of the funnel-shaped expansion can be further developed in such a way that the closed flat end (111) has a rubber coating. This prevents damage to the tool (1) according to the invention on the one hand and to its storage or installation location on the other.

A further embodiment of the tool (1) according to the invention provides that the spring (107) accommodated in the interior of the weight (105) is operatively connected to the rod (103), so that when the weight (105) is deflected on the rod (103) relative to the handle element (101), a restoring spring force can be generated.

Specifically, the spring (107) compressed by the weight (105) upon impact, which can be adjusted as described above, exerts a spring force on the rod (103) and the handle element (101) firmly connected to it.

Fig. 1

eine schematische Darstellung des erfindungsgemäßen Werkzeugs 1 in einer bevorzugten Ausführungsform im auseinandergezogenen Zustand,

Fig. 2

eine schematische Darstellung des erfindungsgemäßen Werkzeugs 1 aus Fig. 1 im zusammengeschobenen Zustand,

Fig. 3

eine schematische teilweise Schnittdarstellung des erfindungsgemäßen Werkzeugs 1 aus Fig. 1,

Fig. 4

eine schematische Darstellung des erfindungsgemäßen Werkzeugs 1 aus Fig. 1 im zusammengeschobenen Zustand und

Fig. 5

eine schematische Schnittdarstellung des erfindungsgemäßen Werkzeugs 1 aus Fig. 1.

Further aims, features and possible applications emerge from the following description of non-limiting embodiments of the invention with reference to the figures. All described and/or illustrated features form the subject of the invention either individually or in any combination. They show:

Fig.1

a schematic representation of the tool 1 according to the invention in a preferred embodiment in the exploded state,

Fig. 2

a schematic representation of the tool 1 according to the invention Fig.1 when pushed together,

Fig.3

a schematic partial sectional view of the tool 1 according to the invention Fig.1 ,

Fig.4

a schematic representation of the tool 1 according to the invention Fig.1 when pushed together and

Fig.5

a schematic sectional view of the tool 1 according to the invention Fig.1 .

Identical parts have the same reference symbols in all figures; however, for reasons of clarity, not all parts are provided with reference symbols in all figures.

In Figure 1 the tool 1 according to the invention is shown schematically in a preferred embodiment in the exploded state. The handle element 101 has a rod 103 firmly received therein, which is slidably mounted in the weight 105 at the opposite end. A receiving device 109 is arranged at the outer end of the handle element 101, which serves to receive processing elements. The end facing the weight 105 has a funnel-shaped widening 1011, which serves to better hold the hand and at the same time makes it easier to receive the conical end of the weight 105.

If the weight 105 is moved away from the handle element 101 with a force, a directed force is exerted in the weight 105 when it strikes the second stop 103a. Movement that uses the tool 1 as a deadbolt hammer. If, however, the weight 105 is moved back to the handle element 101 with a swing, a directed movement occurs when it strikes the first stop 101a, which makes the tool 1 usable as a guided impact hammer or mortiser. The work of the tool 1 according to the invention is carried out at the moment the weight 105 strikes one of the stops 101a, 103a.

While the use described above is geared towards two-handed operation, the tool 1 according to the invention also enables one-handed operation in another embodiment, in particular when removing dents. The tool 1 according to the invention is held with one hand on the weight 105, with the funnel-shaped extension 1011 serving here as a grip recess for the thumb.

To use, the tool 1 according to the invention is placed on the area to be dented using a processing element arranged on the receiving device 109. The weight 105 is then moved away from the area to be dented. The spring 107 builds up a spring force which, when a pre-set level is reached, causes the handle element 101 to spring back and thus a denting force on the processing element. This additional function according to the invention allows the operator to catch the handle element 101 with his thumb and immediately place the tool 1 according to the invention back in the starting position.

One-handed operation is particularly important in the practice of dent removal, as the surface of the sheet metal to be removed is simultaneously observed flat in the raking light during processing in order to check the success of the work. This simultaneous observation with raking light and use of a conventional pull hammer has previously been impossible or only possible for very mobile people due to the required two-handed operation. The present invention with the new possibility of one-handed operation makes it possible for the first time to work with a long outstretched arm using one hand.

• das weite "Eintauchen" des Gewichts 105 in die trichterförmige Ausweitung 1011 des Griffelement 101,
• das Zurückschnellen des Griffelement 101 durch die Feder 107,
• die ergonomisch daumengerechte trichterförmige Ausweitung 1011 als eine Art,, Fangvorrichtung".

The newly created possibility of one-handed operation is created by three features of the present invention

• the deep "immersion" of the weight 105 into the funnel-shaped extension 1011 of the handle element 101,
• the springing back of the handle element 101 by the spring 107,
• the ergonomically thumb-friendly funnel-shaped extension 1011 as a kind of "catching device".

In order to facilitate the setting down of the tool 1 according to the invention and to ensure a secure stand, the outer end of the weight 105 has a closed flat end 111. In order to avoid damage, a rubber coating can be applied there.

A schematic representation of the tool 1 according to the invention from Figure 1 when pushed together, it is Figure 2 shown. Because the front part of the weight 105 runs into the funnel-shaped extension 1011 of the handle element 101, the external dimensions of the tool 1 according to the invention are reduced, which makes it easier to handle in use. From this figure it can be clearly seen how the stops 101a, 105a, which are used for the function as a hammer, are concealed in order to significantly increase the protection against injury. The stops 101a, 105a are not accessible from the outside.

Figure 3 shows schematically in a partial section of the weight 105 in particular the arrangement of the second stop 103a and the fourth stop 105b, which are used for the function as a pulling hammer. These two stops 103a, 105b are also concealed to minimize the risk of injury.

In Figure 4 the adjustment of the preload of the spring 107 is shown schematically. This can be achieved simply by turning the weight 105 relative to the handle element 101, whereby both hands can remain on the respective elements and no additional hand tools are necessary. This adjustability can therefore be set directly on the weight 105 without interrupting work.

The hardness of the fourth stop 105b can be cushioned by the spring 107 to influence the impact effect. This stop spring 107 is continuously pre-tensioned and thus the stop hardness is adjusted.

In Figure 5 the tool 1 according to the invention is shown in a schematic section. Here, the spring 107 is shown in particular, which presses against the end of the rod 103 with the stops 103a, 105b. At the outside end, a Nut 113 is provided which has a nose which is guided in a groove (not shown) around the inside of the weight 105. The nut is mounted in the groove in a rotationally secure manner by the nose, which makes it possible to adjust the preload of the spring 107 purely by turning the weight 105.

As already shown above, the tool 1 according to the invention has, in a special embodiment, a combined impact and pulling function.

In vehicles, especially on hoods and under roofs, there are usually braces and joists to stabilize the upper panels, some of which are flexibly bonded to the underside of the upper panel using a very strong putty. To remove dents in the upper panel, these putties or bonds often have to be cut open and removed.

According to the current state of technology, there is currently no suitable solution for this apart from hand-operated long knives. These long knives are very difficult to drive into the cement or adhesive and often get stuck afterwards due to the elasticity of the material.

In the special embodiment, instead of a pure impact attachment or a pure pull attachment, a very flexible knife blade (similar to a bayonet) is placed at the front of the holder 109 of the tool 1 according to the invention. The knife can now be easily rubbed through the cement or adhesive with the impact function through even the smallest openings with little effort and when there is little space to work and also in awkward positions, because the hard impulses of the impact side are sufficient with little force. If the knife gets stuck in the cement or adhesive putty, the knife can be pulled out again using the pull function with easy-to-execute backward impulses. The dual function of the tool 1 according to the invention can be used in one operation here.

List of reference symbols

1

Tool

101

Handle element

101a

first attack

1011

funnel-shaped expansion

103

rod

103a

second attack

105

Weight

105a

third attack

105b

fourth stop

107

Feather

109

Recording device

111

closed flat end

113

Mother

Claims (13)

Tool (1) comprehensive - a handle element (101), - a rod (103) which is firmly received in the handle element (101) and which has a second stop (103a) at its end opposite the handle element (101), - a weight (105) sliding on the rod (103) which has a third stop (105a) on its side facing the handle element (101) and a fourth stop (105b) in its interior, wherein the handle element (101) has a first stop (101a) at its end facing the weight (105), so that the weight (105) can be struck with its third stop (105a) against the first stop (101a) and alternatively with its fourth stop (105b) against the second stop (103a). Tool (1) according to claim 1, wherein the first stop (101a) is concealed inside the handle element (101). Tool (1) according to claim 1 or 2, wherein the weight (105) is tapered on its side facing the handle element (101) so that it is at least partially received in a recess of the handle element (101) when it strikes the first stop (101a). Tool (1) according to one of claims 1 to 3, further comprising a spring (107) which is accommodated in the interior of the weight (105), wherein by rotating the weight (105) the preload of the spring (107) for the impact hardness of the weight (105) can be adjusted. Tool (1) according to one of claims 1 to 4, wherein the handle element (101) has a funnel-shaped widening (1011) at its end facing the weight (105). Tool (1) according to one of claims 1 to 5, further comprising a receiving device (109) arranged on the handle element (101) and oriented towards a workpiece to be treated. Tool (1) according to claim 6, wherein the receiving device (109) receives elements which can be attached to contact points of a structure to be dented for the transmission of force from the tool (1), so that the tool (1) acts as a pulling hammer. Tool (1) according to claim 6, wherein the receiving device (109) receives inserts which can be attached to transmit force from the tool (1) to a structure to be deformed, so that the tool (1) acts as a hammer. Tool (1) according to claim 6, wherein the receiving device (109) receives an insert designed as a flexible knife, which is designed to be introduced into a bond or cement between two body parts by means of the impact function and to be pulled out again by means of the pulling function, so that the bond or cement can be released. Tool (1) according to one of claims 1 to 9, wherein the weight (105) has linear ball bearings in order to slide on the rod (103) in a friction-optimized manner. Tool (1) according to one of claims 1 to 10, wherein the tool (1) has a closed flat end (111) at the outside end of the weight (105). Tool (1) according to claim 11, wherein the closed flat end (111) of the weight (105) is flared into a funnel shape. Tool (1) according to claim 11 or 12, wherein the closed flat end (111) has a rubber coating.

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